Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ede48a6efe7be03…

MALICIOUS

PDF

47.3 KB Created: 2020-09-04 22:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93ff9f8bf5319925fc6e71442a177bc SHA-1: dd3040e7a92651ddbd70375ec63f56e0445bfcea SHA-256: 3ede48a6efe7be0309fdf651281436f1c1fec26477a4cba156223c254136a05b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector URL, which is a common tactic for delivering malicious content or phishing pages. The document body, though heavily obfuscated, contains text related to 'best android emulator to play pubg' and the malicious URL, suggesting a lure to a scam or phishing site. The PDF was flagged by multiple critical heuristics for malicious redirectors and link farms, and a machine learning classifier indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/pify?keyword=best+android+emulator+to+play+pubg
    • https://static.usrfiles.com/ugd/111c46_70c1b821f93249fb8a0080c04af677a7.pdf
    • https://static.usrfiles.com/ugd/17beed_16ab3299ab884946ab2958ae62b42ca6.pdf
    • https://static.usrfiles.com/ugd/227d0f_9918fd967b2d417ca6e414d9db7f2981.pdf
    • https://static.usrfiles.com/ugd/8b9728_c4e3e7f5858d4e29815591cbd146b83a.pdf
    • https://static.usrfiles.com/ugd/b6aaa0_09a4e26696b44883971e7de3d9431e5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ac3ee028dd74febb13802a87a7de7f6.pdf
    • https://static.usrfiles.com/ugd/b3bc21_f6221f43a87a46d3b498f0ea2edfa3fb.pdf
    • https://static.usrfiles.com/ugd/b18e4d_ebae86dfbf734f23993c258e101c140d.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/gidexi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/vaxoraneliratuxisom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007950.bin
741b0620c07d5f98e3e18d87e092dc40320f2e514063b641c9882d9748d31768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7950 5572 bytes
font_01_sfnt_off00008c2f.bin
b10c0fcb3a7a774866a0127cdb810483b15a145aced4b14bf559f44eb8ac86d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2F 10712 bytes

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